345640 has 16 divisors (see below), whose sum is σ = 777780. Its totient is φ = 138240.

The previous prime is 345637. The next prime is 345643. The reversal of 345640 is 46543.

It is an interprime number because it is at equal distance from previous prime (345637) and next prime (345643).

It can be written as a sum of positive squares in 2 ways, for example, as 298116 + 47524 = 546^2 + 218^2 .

It is a d-powerful number, because it can be written as 3³ + 4² + 6⁷ + 5³ + 4⁸ + 0 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4281 + ... + 4360.

2³⁴⁵⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

345640 is an abundant number, since it is smaller than the sum of its proper divisors (432140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

345640 is a wasteful number, since it uses less digits than its factorization.

345640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8652 (or 8648 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 345640 is about 587.9115579745. The cubic root of 345640 is about 70.1791330365.

The spelling of 345640 in words is "three hundred forty-five thousand, six hundred forty".